Malicious PDF — malware analysis report

Static analysis result for SHA-256 88e02272b8b3c575…

MALICIOUS

PDF

71.3 KB Created: 2021-05-29 10:14:13 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-11-25
MD5: c6f3d3202dfab07ee887b34ad92b6624 SHA-1: 4cd5a44c65acf4ed1da3cba6f5c7be61526f0e73 SHA-256: 88e02272b8b3c57521b42bb6cc06c3676e5e13d647515694e6fac36e752b666b
186 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1059.007 JavaScript

The PDF file contains a large number of external links, many pointing to disposable hosting services, suggesting a link farm or phishing operation. The ML classifier and ClamAV detection strongly indicate maliciousness. While no scripts were explicitly extracted, the PDF structure and extensive external linking are indicative of malicious intent, potentially leading to further compromise.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9998

Heuristics 6

  • ClamAV: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0
  • Small PDF contains mass external PDF link farm critical PDF_SEO_LINK_FARM
    Small PDF contains many clickable external PDF links, mostly clustered on one host. This matches generated SEO/link-farm PDF carriers used to route users into malicious or unwanted-software delivery chains, rather than a normal document citation pattern.
  • Small PDF is a non-clustered link farm on disposable hosting medium PDF_SEO_DISPOSABLE_LINK_FARM
    Small PDF contains many clickable external PDF links spread thin across many distinct hosts (no single dominant host), corroborated by a utm_term SEO-redirector link and/or links parked on free/disposable content hosts. This is the 'free document/template' SEO phishing PDF family, which ranks for search queries and routes users into payload/redirect chains, rather than a normal document citation pattern. The PDF itself carries no exploit — the risk is the linked destinations.
  • External URI info PDF_URI
    PDF contains an external URL action
  • Object number defined twice with different bodies info PDF_DUPLICATE_OBJ_BODY_INCREMENTAL
    The same indirect object (N G) is defined more than once with different body bytes. First-wins and last-wins readers will resolve different content, which is a parser-confusion shape used by targeted PDFs. Body-only differences are common in benign incremental updates, so severity is raised only when the duplicate carries active content.
  • Embedded URL info EMBEDDED_URL
    One or more URLs were extracted from the document. The URL itself is not a detection — see the per-URL labels for which channel (macro, JS, link annotation, document body, ...) reached each URL.
    URL https://kuzutuzo.ru/strik?utm_term=ejercicios+matematicos+de+cuarto+grado+de+primaria+pdf PDF link annotation
    • https://defuboxuzunusam.weebly.com/uploads/1/3/3/9/133986960/judutusunakudasej.pdfIn PDF document text
    • https://kizubunutasi.weebly.com/uploads/1/3/5/3/135348794/5747013.pdfIn PDF document text
    • https://kabosasano.weebly.com/uploads/1/3/5/3/135398154/8012714.pdfIn PDF document text
    • https://xuvifadeto.weebly.com/uploads/1/3/2/6/132682806/1656782.pdfIn PDF document text
    • https://volatofe.weebly.com/uploads/1/3/4/4/134442598/2035767.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4368242/normal_5fe33f311905a.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4496826/normal_605a510221818.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4481684/normal_604464ab74eee.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4421058/normal_602efbac61f94.pdfIn PDF document text
    • https://jitolubupiloz.weebly.com/uploads/1/3/4/6/134637312/2950004.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4415951/normal_603a72bb1b120.pdfIn PDF document text
    • https://ronupajowosoza.weebly.com/uploads/1/3/4/8/134871490/zilolisadivopixag.pdfIn PDF document text
    • https://xasuzetevoke.weebly.com/uploads/1/3/2/6/132681443/febusirinalosabar.pdfIn PDF document text
    • https://wapojopaboxijok.weebly.com/uploads/1/3/4/7/134747084/zilifusodipo.pdfIn PDF document text
    • https://bolififona.weebly.com/uploads/1/3/4/3/134316640/fafoxipalu_sowirogixetu.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4402717/normal_605c86b6760c1.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • http://www.w3.org/1999/02/22-rdf-syntax-ns#In PDF document text
    • http://purl.org/dc/elements/1.1/In PDF document text
    • http://ns.adobe.com/pdf/1.3/In PDF document text
    • http://ns.adobe.com/xap/1.0/In PDF document text
    • http://ns.adobe.com/xap/1.0/mm/In PDF document text
    • http://ns.adobe.com/xap/1.0/rights/In PDF document text
    • http://scripts.sil.org/OFLIn PDF document text

Extracted artifacts 2

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000d680.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD680 5476 bytes
SHA-256: abe0741862e411e375bfa6a26c355c493af52914d4e8d36e66b7c44343dad586
font_01_sfnt_off0000e916.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE916 11364 bytes
SHA-256: d67cc544f94c96d3e9fac750355dc122a5874d472919d6d154f9a5a07404517c

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